Vacuum-tube receptacle



P. CROSLEY, JR

VACUUM TBE RECEPTACLE jFiled Deo. '7. 1921 'JN VEA/TOR A TTORNE Y Patented Dee. 14, 1926.

PATENT oFFICE.-

POWEL CROSLEY, JR., 0F CINCINNATI, OHIO.4

vacuum-TUBE RECEPTAGLE.

Application led December 7, 1921. Serial No.` 520,644.

My invention relates to radio communication, and its object is to simplify and increase the efficiency and durability of sockets or receptacles for holding and connecting to the appropriate conductors the vacuum-tube device for continuous-wave generation or conversion, especially valuable in radio telephone systems. Other objects will appear in the course of the ensuing description.

, I attain these objects by the device illustrated, for example, in the accompanying drawings, in which Figure l is a top plan view of the device;

Fig. 2 is a bottom plan view of the same;

Fig. 3 is a front elevation thereof;

Fig. 4 is a vertical section on the plane of the transverse line 1f-Jl of Fig. 1;

Fig. 5 is a side elevation of the device;

Fig. 6 is a vertical section on the plane of the front-to-rear line 6*-6 of Fig. 1; and

Fig. 7 is a rear elevation of the device.

The apparatus held in and connected by means of my improved receptacle consists of a glass bulb with a connecting cylindrical base similar to an electric-light bulb, containing a filament and one or more metal plates, with one or more wire grids, a grid eing between the filament and a plate, in a vacuum in the bulb, the various elements to be connected in such a manner that incandescence of the filament constitutes the vacuum space between the filament and the grid and plate a check-valve to alternating current, allowing current to pass from plate to filament. but not in the reverse direction. Such a device and its purpose and mode of operation are well known in the art, and need no illustration or further description herein, except to say that, as now provided in standard form, this apparatus requires four contact points at the rear end of its cylindrical base, together with a receptacle with a cylindrical socket having in its wall a suitable bayonet slot to receive a projection on the side of the cylindrical base of the bulb as the base is inserted in the socket and rotated slightly therein.

Such devices as have been provided for this have been made up of a number of pieces of dissimilar' material, such as metal and compositions of various kinds, similar to hardv rubber or asphaltum compositions,

which material is not so durable as is desir able, either in itself or in its attachment to the metal parts, and therefore, with the presence of such metal parts in its make up, not so reliable as insulation to the various separate circuits the apparatus requires as above indicated. Also, suchprior apparatus is undesirably expensive, especially in radio outfits for popular distribution, Where first cost and ease of maintenance are especially important considerations.

My improved vacuuin-tube receptacle comprises a base 1 and a socket-body part 2 projecting up from the base, with a back 3 joining both the base and the part 2 and extending a considerable distance up the rear side of the part 2. The socket part 2 is open from top to bottom, through the base 1, and is of cylindrical-shape interiorly and of a diameter to receive the cylindrical base of the vacuum tube, before mentioned, snugly.A In its interior wall, at the rear, up close to its top and opening up through the top edge of the part 2, this part has a bayonet slot vconsisting of the upright part 4 that opens through.

the edge, and a circumferential or horizontalpart 5 that extends from the lower end of the part- 4 with its upper wall 6 slanted up from the junction with the part 4. Preferably, this slot does not extend entirely through the wall of the cylindrical socket part"2, but only about half Way therethrough.

The base 1 extends out past the outer walls of the socket part 2 at the sides and front; the exterior of the socket part 2"`preferably being cylindrical and concentric with the interior, and the base 1 at the sides being straight from somewhat forwardly of the transverse center line of the socket part 2 back to the rear 'edge at the bottom of the back 3, and conforming to the arc of a circle concentric with the part 2 in its front part. At the middle of the segmental front projectioilj'of the base thus formed, is a hole 7 down through the base; the outer wall `of the part 2 being recessed, from top to bottom at 8 to afford free access-to this hole 7.

At the rear end of the base 1, which pro` jects back from the socket part 2, the back il has a middle recess 9 at the opposite sides of which the back 3 extends forward and joins the socket part 2; and in the mid- 'dle of this rear end projection of the base l is a hole down through the base. vAt opposite sides of the socket part 2 the back 3 has holes 1l back through it. The ,rear

. side of the back 3 and the under side of the4 base 1 are flat and at right angles to each i other; so the receptacle can be screwed down to a horizontal surface through the holes 7 and 10, or screwed to a verticahsurface through the holes 11.

Equally spaced forwardly and rearwardly from the transverse center line of the socket,

. at each side o f the socket, is a pair of transverse parallel recesses 12 and 13, extending from the'base lateral edge into the socket opening, in the flat under surface of this` base l; being of depth about equal to half the thickness of the base.

tension of the base past the exterior of the socket part 2, is an opening 14. Contact blades 15 of fiat elongated shape have thelr ends in the respective recesses 12 and 13 and are fixed therein by bolts 16 passing up through the blades 15 andy through the openings 14, with nuts 17 and lock1nuts 18 on their upper ends above the base extensions. These nuts hold the blades in place, and serve as binding means for the terminal connections of the apparatus. The blades 15 bend slightly upward in their extension in toward the front-to-rear cent'er line of the receptacle, where their inner ends are materially separated; these blades `15 being adapted to receive respective contact points on the base of the vacuum tube when the latter is inserted and partly rotated in the socket part 2 and its projection rides into the bayonet slot part 5, thus making 'the connections to the Various elements of the vacuum'tube and supporting it firmly in position With adequate insulation at'all times..

The receptacle is made with the base 1, socket part 2 and back 3 integral, preferably of earthenware such as porcelain of the practice.

What I claim as new and desire to secure by Letters Patent is:

' 1. A vacuum-tube 'receptacle comprising a socket member having an integral rlb projecting from its outer surface and extending longitudinally thereof, said rib having a support engaging surface extending substantially parallel to the axis of the socket,

From each re cess 12 or 13 up through the lateral ex` and means providing additional sup ort engaging surface disposed substantially at right angles to said support engaging surface of said rib.

2. A vacuum-tube receptacle comprising a socket member having integral ribs projecting in opposite directions from its outer surface and extending longitudinally thereof, said ribs having support engaging surfaces extending substantially parallel to the axis of the socket, and means providing additional support engaging surface disposed substantially at right angles to said support engaging'surfaces of said ribs.

3. A vacuum-tube receptacle comprising a socket member having an integral rib projecting from its outer surface and extending longitudinally thereof, said rib having a support engaging surface extending substantially parallel to the axis of the socket,

and a flange projecting from the outer surface of said socket member near one end of said member and providing additional su port engaging surface disposed substantial y at right angles to said support engaging surface of said rib.

4. A vacuum-tube receptacle comprising a socket member having integral ribs projecting in opposite directions from its outer surface and extending longitudinally thereof, said ribs having support engaging surfaces extending substantiall parallel, to the axis of the socket, and a flange projecting from the outer surface of Said socket member near `one end of said member and providing additional .support engagin surface disposed substantially at right ang es to said support engaging surfaces of said ribs.

5. A vacuum-tube receptacle comprising a socket member having a flange projecting from the-outer surface of said socket member near one end thereof, with an opening through said flange, for attaching said receptacle to' a sur ace Isubstantially at right angles to the axis of a tube mounted in said socket, and having means near one side of said socketifor attaching said receptacle to a surface substantially parallel to a tube mounted in the socke 6. A vacuum-tube receptacle comprising, in one integral body, a base, a back, and a socket-body part joining said base and back, said socket-body part opening down through said base, and said base having transverse parallelreccsses in its bottom, opening into opposite sides of said socket opening, and said back having a middle recess and said ba;J having an opening doivnthrough it within said recess of said back.

7. A vacuum-tube receptacle comprising, in one integral body, a base, a back, and a socket-body part joining said base and back and having a bayonet slot partly through its wall, said socket-body part opening down through said base, and said base having f-transverse parallel recesses in its bottom, extending longitudinally thereof, said rib opening into opposite sides of said socket liavin a support engaging surface extendl0k `opening,"and said back having a middle re lng-su stantially parallel to the axis of the cess and'said base having an opening down socket, and means providing additionalsupthrough it within said recess of said back. port lengaging surface disposed to one side 8. A receptacle for audions comprising a of said rib. I tubular socket member having an integral rib projecting from its outer surface and POWEL CROSLEY, JR, 

